Abstract
Experimental findings of turbid zones in the schlieren patterns of gels in a centrifugal field are explained by a demixing of gels into a highly swollen gel coexisting with a collapsed gel. The thermodynamic analysis of a slightly cross-linked aqueous gel at relatively low centrifugal field, which remains clear, leads to the conclusion that the system is close to its stability limit. A procedure is proposed to show how the stability limits may be extrapo lated by means of ultracentrifugal measurements. The phenomena are separated into a transient and a permanent demixing. The permanent demixing has been qualitatively explained by use of state diagrams predicted recently by Khokhlov and coworkers, Ilavsky and also by Moerkerke et al.
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Borchard, W., Cölfen, H., Kisters, D., Straatmann, A. (2002). Evidence for phase transitions of aqueous gelatin gels in a centrifugal field. In: Borchard, W., Straatmann, A. (eds) Analytical Ultracentrifugation VI. Progress in Colloid and Polymer Science, vol 119. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-44672-9_15
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DOI: https://doi.org/10.1007/3-540-44672-9_15
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